Hoist



Sept. 2, 1924.

' J. E. JONES ET AL HOIST Filed May 20, 1922 4 Sheets-Sheet 1 Sept. 2,1924.`

J. E. .JONES ET AL HOIST Filed May 20 1922 4 Sheets-Sheet 5 Sept. 2,1924. 1,507,064

. J. E. JONES ET AL HOIST Filed May 20, 1922 4 Sheets-Sheet 4 W Y Y VJ 7H'll WM5 4g 95515 97 L95 PetentedSe'pt. 2, 1924. v i

UNITED- STATES PATENT oFFlcE.'

.um n. Jorim un wILIIELnor'ro GBUENEWALD, or cIIIcAGo, ILLINOIS; earn iGnUmmwaLn AssIGNon or rIrrY-oNE PEB. CENT 'ro SAID Jours.

noIs'r. Y

Appnmmn mea my' 2o,

To all lwhom t may concern:

Be it known that we, JAMEB E. JoNEs and WILHELM O. GRUENEWAID, bothcitizens .of the United States, residing at Chica o, in the county ofCook and btate of ois, have invented certain new and useful Improvements in Hoists, of which thek following is a specification.

This invention relates to a power hoist adapted to move a load from arst to a second position; more particularly 1t has reference to anapparatus of this kind which includes in its mechanism a pair ofswineing arms adapted to caril?v on their free en s a oad, such as abarr for example, for deposit upon an elevated structure, and means bywhichthe operating power is automatically controlled.

An exempliiication of our invention is shown in the accompanyingdrawings in the manner following:

Figure l is a plan view of the hoist;

F ig. 2 is al. longitudinal section therethrough on line 2 2 of Fig. 1;

Fig. 3 is a similar view taken onl line 3-3 of Fig. 1;

Fig. 4 is a side elevation of the hoist arranged adjacent a platformupon which the load may be deposited;

Fig. 5 is a detail in longitudinal section of certain parts at thepivoted end of the arms;

Fig. 6 is a similar view showing the relation ofthe parts when the loadis removed;

Fig. 7 is a detail in elevation of the receiving end of the hoistshowing certain Q parts which control the rolling of the load thereupon;

Fig. 8 is a plan view thereof; and-- Fig. 9 is a view similar to F1g.'7,with the parts in the position which is assumed when one load is inprocess of being hoisted, and another load is awaiting its turn.

As shown, the hoist of our invention makes use of a frame composed" of apair of channel members 10 extending for the length of the apparatus andconnected by suitable cross braces 11. To facilitate movement ofthisframe upon the oor, we have shown at its forward end a pair of wheels 12mounted upon the ends 13 of a crank axle 14.-. Formed in the axle is asecond crank 15 to which is connected a link'16 (see Fig. 3) pivoted toone end of 'a rocker arm 17 mounted to rotate about an axis 1'8.

1922. Serial H0. 562,338.

At its opposite end the rocker arm connects with a second link 19 whichextends rearwardly for pivotal connection with a bracket 20 projectinglaterally4 from a bar 21 which is mounted rotatably between the channelmembers. A yoke 22 ha a swiveled mounting on the bar carries mtird wheel23, and by means .of a crank (not shown) applied to the oke head 24 thebar or the wheeler bot may be rotated. By rotating the bar, the parts'associated therewith, including Athe crank axle, are also moved withthe result that the crank axle is rotated tolift the wheels 12 from theground, allowing the frame in conse uence to rest thereupon. It shouldbe note that .in thesemovements the bar and crank axle are turned inopposite directions, thereby moving the wheels 12 and wheel 23 toward Ior from each other; this results in a minimum longitudinal movement onthe part of the frame. When in raised position, the parts are maintainedstationary as through the medium of a notched latch bar 25 adapted todrop over one edge of an angle iron 26 extending between the sidemembers of the frame. The release of this latch bar from lockingposition may be effected with the aid of a treadle 26 pivotedas at 27and engaging with one end the latch bar so as to raise the same. Theconstruction just described affords one convenient means by which theframe may be moved about conveniently preliminary to being rested uponthe floor for operatic The hoist proper includes a shaft 30 rotatablyjournaled in suitable bearings 31 one arranged at the forward end ofeach member; a pair of lifting arms 32 each having one vend mounted onthe shaft, the arms being preferably arched or bent as at 33 so as toproceed 'rearwardly' from the shaft first in an upward direction andythereafter ina downward direction; and suitable braces 34 and 35 extendbetween the arms, the latter being inthe form of a bar or shaft.Connected with this bar is the outer end ofV a plunger 36 with which isassociated a piston (not shown) adapted to plied m acorrespondingdirection.

At its free end each lifting arm is provided with an u ward extension 41which provides a stop or the cylindrical body of the load 42 whenreceived on the arms for purposes of hoisting. At its extremity 43 eacharm curves downwardly to lie just below the upper face of the framemember 10, and thence upwardly so as to form a seat or cradle for theload when the lifting arms are raised.- Between the two side members ofthe frame is pivoted, as at 45, an arm having a bend in the general formof a bell crank. One end 46 of this arm normally protrudes in the pathof the load when received upoi the cradled arms, the result being thatthe crank is shifted to a position such as is shown in Fig. 2.Connecting with the opposite end 47 of this crank arm is a link 48 whichconnects also with a rocker arm 49 pivoted as at 50. Extending from theopposite end of the rocker arm is a secondv link 51 which connects alsowith a handle 52 controllin a valve 53 in a pipe line 54V through whiifluid pressure is led to the cylinder 37. By moving the controllinghandle 52v through operation of the parts connected therewith which areset 1n motion by the weight of the load upon the hoisting arms, thepiston mechanism is operated to lift the arms with the load thereon soas to deposit the same upon a higher elevation such as the platform 55(see Fig. 4). The connections leading to the handle 52 may be adjustedin any of the usual manners so as to ensure proper efficiency inoperation.

Connected with the pipe line 54 is an exhaust valve 60, the operation ofwhich is automatically controlled by the movement of the hoisting arms,as is also the closing ot' the inlet valve 53. The means foraccomplishing this includes an exhaust valve operating handle 61 withwhich is connected a rod 62 having one end threaded as at 63; this rodend is slidablyl extended through a block 64 that is swivelly mounted onone of the hoisting arms near its pivoted end. A second rod 65 alsothreaded at one end 66 1s slidably extended through another block 67also swivelly secured to the hoisting arm, this last rod being connectedas at 68 with the controlling handle 52 of the inlet valve. Upon thethreaded end of each rod are lock nuts 69, and interposed between thesenuts and the associated block 64 or 67 are coiled s rings 70. As thehoisting arms approach t eir highest positions, the gap between eachspring 70 and the ude block associated therewith is reduce until finallyone contacts with the other, thereby imparting to the two rods 62 and 65a linear movement such as to ull both valve handles at the same time.ith operation of the inlet valv the flow of pressure medium to thecylineder is checked, while with operation of the other valve a passageis opened up -for Referring now to Figs. 5 and 6 where the hoisting armsare shown in a sition of maximum height, it will be note in the formerfigure that the load is still carried on the lifting arms. Upon one ofthese arms is pivoted, as at 75, a link 76 adapted to rest against a stol upon by the load. ormally, however, the link is maintained in theposition of Fig.

6, as through the medium of a spring 78` which is colled around a rod 79 connected at 80 with a link 76; and one end of the spring bearsagainst a collar 81 which surrounds the rod while the other spring endengages a ide block 82 through which the rod is eely extended. Near thepivoted end of the hoisting arm is swingi ly mounted a latch bar 83having a tlexile connection 84 with the rod 79. At its acting end thelatch bar is notched, as at 85, so as to engage with the angle iron 26extending transversely between the frame members, when the parts are inthe relation shown in Fig. 5. The hoisting arms are here represented asready to de sit the load upon the elevated platform, t is transfer beingaccomplished by. ravity due to the downward inclination o? the extensionarms 41 when in this position. During the unloading operation t ehoisting arms are 77 when held thereprevented from oscillating back dueto the action of the latch bar 83. With release of the load, however,the spring 78 operates to lift the rod 79 and with it the latch bar 83(see Fig. 6), thereby permitting the hoisting arms to drop back tohorizontal position, as shown in Fig. 2. This return movement of thehoisting arms 1s accom-y plished by gravity, since the preponderance oftheir weight remains always to the rear side of the shaft 30.

In Figs. 7 to 9 inclusive, we have shown a means for controlling themovement of rolling loads to position upon the hoisting.`

arms. With the use of such a device, a

number of barrels, for instance, may be` arranged one behind the otheruponI inclined rails, so as to roll by gravity upon the hoisting armsand be successively carried `thereby to an elevated platform, all

without manual regulation or attention.

Adjacent the rear end of the frame there is mounted as at 90 a rockerarm of which one end 91 upstands to form a stop for a barrel 92 whenmoved to a position just preliminary to rolling upon the lifting arms.The other end 93 o the rocker arm lies beneath the barrel to be engagedthereby so as to maintain the stop end 91 in upright position. Inaddition we .have formed on the front edge of the arm end 91 one or moreteeth 94 with which may enga e a hook 95 formin part of an arm 96 w ichrocks about a plvot 97, a spring 98 serving normally to maintain thehook end Aof this arm in enga g relation with the toothed end of the roc`'er arm first mentioned. Extendin laterall from the arm 96 is a head 99w ich lies neath the arm extremities '43 sosas to be engaged therebywhen the hoisting arms are in lowermost position (see Fig. 7). When sorelated, the hook 95 becomes disengaged from the teeth 94 permitting thestop 91 to drop down with forward movement of the barrel. Thereafterwhen the barrel 92 is received on the cradle arms and the hoistingoperation is under way, the stop 91 will again rise up under the actionof the spring actuated arm 96 whose hook end will reengage the teeth.

94 for this purpose. l

A hoist answerin to the preceding description ma be a vantageously usedfor lifting barre s or other loads from a first to a second position. Asa suitable pressure medium for operating the piston mechanism,compressed air is suggested but it should be borne in mind that theparticular kind of power medium or form of ower device used to effectthe lifting of the oisting arms is relatively immaterial to thisinvention. Of more importance is the construction and arrangement of thevarious parts in their special relation to each other for the purpose ofcontrolling the operation of the hoistin arms, and of guarding againstaccident uring the intervals when the load is being received ordischarged.

e claim:

1. In a hoist, the combination with -a frame of a pair of hoisting armspivotally mounted thereon, each of the arms being extended from itspivotal connection first upwardly and rearwardly and then downwardly andrearwardly, whereby a bend is formed intermediate of its ends, means onthe free ends of the arms for carrying a load, a connection between thearms'in the region of the bend in each, piston mechanism mounted on theframe and adapted to exert an upward and forward force against theconnection between the arms, means foradmitting uid pressure to andexhausting the same from the piston mechanism, controllin meanstherefor, including an inlet valve an an outlet valve, and means forimparting movements to the two valves, having conautomatically nections,one adapted to be engaged by thc load when received on the hoistingarms, whereby the inlet valve is opened to ca-use said arms to rise, andthe other adapted to be engaged by the arms when the same have risen toa desired point whereby the exhaust valve is opened to permit a returnmovement of the arms, substantially as described.

2. In a hoist, the combination with a frame having two side members of apair of load receiving hoisting arms pivoted to one end of the frame andadapted to swing .upwardly from a substantially horizonta positionthereupon, the hoisting arms being disposed to the inside of the framemembers vand having connections with each other suoli as to move inunison, means carried on the `swinging ends of the arms adapted toreceive thereon a load, pressure operated piston mechanism adapted tolift the arms together with the load thereon, and other meanscontrolling the pressure acting on the piston mechanism having aconnection with the frame at a point adjacent to the position whereinthe load is received on the arms for hoisting', said connection beingengagea-ble by the load to acuate the controlling means whereby thepiston mechanism is caused to operate, substantially as described.

3. In a hoist, the combinationy with a frame of a hoisting means movablymounted thereon, a seat on said means for receiving a load, a valvecontrolled piston mechanism for operating the hoisting means, and a pairof connections from the piston mechanism controlling valve adapted forsuccessive engagement, one by the load when positioned on its seat andthe other by the hoisting means when elevated to a desired point, thesaid successive engagements with the valve connections operating toeffect through the piston mechanism a single complete cycle of movementof the hoisting means, substantially as described.

4. In a hoist, the combination of a pivoted hoisting arm adapted toswing from a load receiving to a load dischar 'ng position, powermechanism operative connected therewith, a controlling device gir thepower mechanism, having a connection with the arm such as to arrestoperation' of the power mechanism when the arm has reached its loaddischarging position, means carried b the arm forming a support for theloa a latch for restraining the arm in its load discharging position,and a connection with the latch acted upon by the load when dischargedfrom the arm such as to release the arm for return movement to its loadreceiving position, substantially as described.

5. In a hoist, the combination of a vframe whereon is a pivotedload-receiving arm having a power mechanism for movin the same upwardlyfrom a substantially orizontal position, controlling devices forregulating the action of the power mechanism, and connections from saiddevices, one which is loose ext-ending to the arm, and another to theframe in a manner to be engaged by a load when `positioned on the arm,whereby one of the controlling devices is acuated to start operation ofthe power mechanism, the other connection which is loose with respect tothe arm'being thereafter moved by the arm to stop operation of the powermechanism at a. de

sired point in the cycle of the arm movement, substantially asdescribed.

JAMES E. JONES. WILHELM OTTO GRUENEWALD. Witness:

EPHRAIM BANNING.

